The family of a 25-year-old British-Iranian woman imprisoned for trying to attend a men's volleyball game is pleading for her release.

Ghoncheh Ghavami has been detained for three months following the incident and on Tuesday was formally charged with "propaganda against the regime," which could land her several years in prison, The Guardian reported.

Her brother, Iman Ghavami, told the newspaper that the family is devastated and issued an emotional plea for her release.

"My parents are devastated. My mum [mom] is restless. She is breaking down emotionally all the time," he told the paper, adding that his surgeon father has been unable to work because of the ordeal.

Ghoncheh, a law graduate of SOAS, University of London, was arrested in June after trying to watch a men's volleyball match at the Azadi stadium in Tehran, according to The Guardian.

The young woman's actions reportedly violated the country's ban on women attending large sporting events.

On Tuesday, Iman flew to New York hoping to get the attention of Iranian president Hassan Rouhani, who is speaking at the UN general assembly.

He has also started a petition on Change.org that has more than 223,000 signatures.

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